address #92 (comment) again

Author: lucidrains

meshgpt_pytorch/meshgpt_pytorch.py

@@ -158,14 +158,17 @@ def get_derived_face_features(
     face_coords: Float['b nf nvf 3']  # 3 or 4 vertices with 3 coordinates
 ):
     is_quad = face_coords.shape[-2] == 4
-    face_coords_shift = 2 if is_quad else 1 # @sbriseid says quads need to be shifted by 2
 
     # shift face coordinates depending on triangles or quads
 
-    shifted_face_coords = torch.roll(face_coords, face_coords_shift, dims = (2,))
+    shifted_face_coords = torch.roll(face_coords, 1, dims = (2,))
 
     angles  = derive_angle(face_coords, shifted_face_coords)
 
+    if is_quad:
+        # @sbriseid says quads need to be shifted by 2
+        shifted_face_coords = torch.roll(shifted_face_coords, 1, dims = (2,))
+
     edge1, edge2, *_ = (face_coords - shifted_face_coords).unbind(dim = 2)
 
     cross_product = torch.cross(edge1, edge2, dim = -1)

meshgpt_pytorch/version.py

@@ -1 +1 @@
-__version__ = '1.5.11'
+__version__ = '1.5.12'